tests: use "Exit $fail", not (exit $fail); exit $fail

* tests/test-lib.sh (Exit): New function by Ralf Wildenhues in automake
http://git.sv.gnu.org/gitweb/?p=automake.git;a=commitdiff;h=20594c08f63
* tests/**: Convert all uses:

This restrictive change converted the vast majority:

  git grep -l '^(exit \$fail); exit \$fail$' \
    | xargs perl -pi -e 's/'^\(exit \$fail\); exit \$fail$/Exit \$fail/'

And this did the rest, plus a few undesirable ones, so I manually
backed out the changes to ChangeLog-* and build-aux/check.mk:

  git grep -l -E '\(exit [^)]+\); exit ' \
    | xargs perl -pi -e 's/\(exit (.+?)\); exit \1/Exit $1/'

4 files changed, 4 insertions, 4 deletions

diff --git a/tests/dd/misc b/tests/dd/misc
index 04318f08a..4fdebc2cd 100755
--- a/tests/dd/misc
+++ b/tests/dd/misc
@@ -98,4 +98,4 @@ compare err_ok err || fail=1
 
 test $fail -eq 0 && fail=$warn
 
-(exit $fail); exit $fail
+Exit $fail
diff --git a/tests/dd/not-rewound b/tests/dd/not-rewound
index b0bdf120e..8c811811e 100755
--- a/tests/dd/not-rewound
+++ b/tests/dd/not-rewound
@@ -33,4 +33,4 @@ case `cat out` in
   *) fail=1 ;;
 esac
 
-(exit $fail); exit $fail
+Exit $fail
diff --git a/tests/dd/skip-seek2 b/tests/dd/skip-seek2
index 1381305f9..c831c85aa 100755
--- a/tests/dd/skip-seek2
+++ b/tests/dd/skip-seek2
@@ -40,4 +40,4 @@ case `cat out` in
   *) fail=1 ;;
 esac
 
-(exit $fail); exit $fail
+Exit $fail
diff --git a/tests/dd/unblock-sync b/tests/dd/unblock-sync
index b66653340..2adcbb7fd 100755
--- a/tests/dd/unblock-sync
+++ b/tests/dd/unblock-sync
@@ -37,4 +37,4 @@ EOF
 
 compare out exp || fail=1
 
-(exit $fail); exit $fail
+Exit $fail